Method for avoiding burn of titanium alloy bushings coated with PVD TiN

Abstract

Processing method for avoiding burning of titanium alloy bushing coated with TiN by PVD, belongs to the technical field of bushing production. The method comprises the following steps: S1: pretreatment; S2: numerical control rough machining; S3: bench work and stress relief; S4: numerical control semi-finishing and grinding; S5: numerical control finishing; S6: inspection and treatment. The present application increases the stress relief process before the finishing process, releases the stress generated during the rough machining of the part, and avoids the deformation of the workpiece caused by stress release during finishing or PVD TiN coating process, resulting in size out-of-tolerance. Adjust the marking process sequence of the workpiece, which can effectively prevent the high-precision size of finishing from deforming due to external force during the marking process, resulting in size out-of-tolerance.

Description

Technical Field

[0001] This invention relates to a processing method for avoiding burns on PVD-coated TiN titanium alloy bushings, belonging to the field of bushing manufacturing technology. Background Technology

[0002] Titanium alloys are widely used in aerospace, automotive, and medical device industries due to their excellent mechanical properties and good corrosion resistance. To meet specific working environments and performance requirements, titanium alloy bushings typically require PVD coating with TiN. However, during grinding, the bushings are prone to burning due to high temperatures and friction. This not only affects the product's appearance but can also lead to performance degradation or even failure. Therefore, preventing burning of titanium alloy bushings during processing is a pressing issue that needs to be addressed. Summary of the Invention

[0003] To address the problems existing in the background art, the present invention provides a processing method for avoiding burns on PVD-coated TiN titanium alloy bushings.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a processing method for avoiding burns on titanium alloy bushings coated with PVD-coated TiN, the method comprising the following steps:

[0005] S1: Preprocessing;

[0006] S2: CNC lathe roughing;

[0007] S3: Fitter work and stress relief;

[0008] S4: CNC lathe semi-finishing and grinding;

[0009] S5: CNC lathe finishing;

[0010] S6: Inspection and Processing.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The present invention adds a stress relief process before the finishing process to release the stress generated during the rough machining of the part, and avoids the workpiece deformation caused by stress release during finishing or PVD coating TiN process, which would lead to dimensional deviations.

[0013] 2. This invention adjusts the marking process sequence of the workpiece, which can effectively prevent the high-precision dimensions of the finishing process from being deformed due to external forces during the marking process, resulting in dimensional deviations.

[0014] 3. The present invention adds a grinding process. Since the marked surface of the workpiece is exactly the positioning surface of the finishing process, the flatness of this end face will be affected by the mark and will produce defects. Therefore, the grinding process can ensure the finishing dimensions.

[0015] 4. This invention changes the finishing process from ordinary grinding to turning, which avoids workpiece burning while ensuring high-precision dimensions. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] A processing method for avoiding burns on PVD-coated TiN titanium alloy bushings, the method comprising the following steps:

[0018] S1: Preprocessing;

[0019] Pretreatment includes preparing titanium alloy bushing blanks that meet design requirements, cleaning, and degreasing.

[0020] S2: CNC lathe roughing; Roughing steps: spindle speed n = 160 r / min, cutting feed f = 0.1 mm / r, end face finishing step leave allowance of 0.03-0.05 mm, inner hole finishing step leave allowance of 0.08-0.1 mm.

[0021] S201: Perform rough machining on the end face and outer diameter to establish machining datum.

[0022] S202: Perform further rough machining on the end face to polish the entire surface of the part, providing a good foundation for the subsequent PVD coating TiN process of the test piece.

[0023] S203: Processing test pieces: According to the requirements of the PVD coating TiN process, process the corresponding test pieces to verify the feasibility of the coating process.

[0024] S204: CNC lathe and machining center machining: rough machining of the inner hole using a CNC lathe to remove most of the excess material.

[0025] S205: The outer contour shape of the bushing and the mounting holes for assembly are machined using a machining center, as well as the assembly interference structure is designed in another direction.

[0026] S3: Benchwork and Stress Relief: Benchwork operations remove burrs and mark the parts. Stress relief is then performed to release the stress generated during the roughing process, reducing the risk of deformation and cracking in subsequent machining.

[0027] S4: CNC Lathe Semi-finishing and Grinding: Semi-finishing of inner holes and end faces is performed using a CNC lathe. A fitter removes burrs and marks the parts. Then, a grinding operation is performed to grind the locating planes for the next process, improving machining accuracy and surface quality.

[0028] S5: CNC Lathe Finishing: A CNC lathe is used for finishing the outer diameter and inner hole to achieve the required precision and surface roughness. Finishing step: Spindle speed n = 130 r / min, cutting feed f = 0.08 mm / r.

[0029] S6: Inspection and Processing.

[0030] S601: Cleaning and Inspection: After deburring by a fitter, ultrasonic cleaning and pressure cleaning are performed to thoroughly remove dirt and grease from the surface of the parts. Dimensional inspection is then conducted to ensure the parts meet design requirements.

[0031] S602: PVD Coating of TiN and Physical and Chemical Testing: PVD coating of TiN is performed on the relevant surfaces according to the design drawings using specialized equipment. Then, physical and chemical testing is conducted to verify the results of the PVD coating of TiN and ensure that the coating quality and performance meet the requirements.

[0032] S603: Final Inspection and Washing & Packaging: Conduct a final inspection to confirm the parts before delivery. Finally, perform a washing operation to remove any residue that may have been generated during processing, and then package the parts for transport and storage.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the present invention.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A processing method for avoiding burns on PVD-coated TiN titanium alloy bushings, characterized in that: The method includes the following steps: S1: Preprocessing; Pretreatment includes preparing titanium alloy bushing blanks that meet design requirements, cleaning, and degreasing. S2: CNC lathe roughing; S201: Perform rough machining on the end face and outer diameter to establish machining datum; S202: Perform further rough machining on the end face to polish the entire surface of the part, providing a good foundation for the subsequent PVD-coated TiN process of sample processing; S203: Processing test pieces: According to the requirements of the PVD coating TiN process, process the corresponding test pieces to verify the feasibility of the coating process; S204: CNC lathe and machining center machining: rough machining of the inner hole using a CNC lathe to remove most of the excess material; S205: The outer contour shape of the bushing and the mounting holes for assembly are machined using a machining center, as well as the assembly interference structure is designed in another direction; S3: Benchwork and Stress Relief: Benchwork operations remove burrs and mark parts, followed by stress relief treatment to release the stress generated in the roughing process, thereby reducing the risk of deformation and cracking in subsequent processing; S4: CNC lathe semi-finishing and grinding: The inner hole and end face are semi-finished by CNC lathe. The fitter removes the burrs and marks the parts again. Then the grinding operation is performed to grind the positioning plane of the next process to improve the machining accuracy and surface quality. S5: CNC lathe finishing: CNC lathe is used to finish the outer diameter and inner hole to achieve the required accuracy and surface roughness. S6: Inspection and Processing; S6 includes the following steps: S601: Cleaning and Inspection; S602: PVD-coated TiN and its physicochemical testing; S603: Final inspection and washing packaging.

2. The processing method for avoiding burns on PVD-coated TiN titanium alloy bushings according to claim 1, characterized in that: S6 includes the following specific steps: S601: Cleaning and Inspection: After deburring by fitter, ultrasonic cleaning and pressure cleaning are performed to thoroughly remove dirt and grease from the surface of the parts. Then, dimensional inspection is performed to ensure that the parts meet the design requirements. S602: PVD-coated TiN and physical and chemical testing: On a special equipment, PVD-coated TiN is applied to the relevant surfaces according to the design drawings. Then, physical and chemical testing is performed to verify the results of the PVD-coated TiN and ensure that the coating quality and performance meet the requirements. S603: Final Inspection and Washing Packaging: Conduct a final inspection to confirm the parts before delivery, then perform a washing operation to remove any residue that may have been generated during processing, and finally package the parts for transportation and storage.